In the NUX, how can you edit cards which are published if nothing shows up in the template library?
Is it possible to add two cards from different boards onto a new board or do you have to rebuild all the cards?
You can save the card into card template library - which can be used on any Board page on a need basis
'Save Card as a Template' feature is available irrespective of the card is published or not on the board. You need to edit the board and then goto to the card, click the 3-dots and you will find that option.
Are you sure you have a Page Builder access? Because that is the only access that is required. Ask your tenant admin if he has given you the access.
If you are already a page builder then Go to Page Designer mode first and then click on three dots of the card
Hope that helps